Chuanli Du This email address is being protected from spambots. You need JavaScript enabled to view it.1,2, Ziyan Guo3, Shuyan Liu4, Xingmin Li1,2, Zipeng Dong1,2, Yan Dong1,2, Yan Peng1,2, Ying Xi1,2

1 Meteorological Institute of Shaanxi Province, Xi’an 710015, China
2 Key Laboratory of Eco-Environment and Meteorology for the Qinling Mountains and Loess Plateau, Xi’an 710015, China
3 Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germay
4 Cooperative Institute for Research in the Atmosphere, Colorado State University, CO 80521, USA


Received: December 11, 2020
Revised: November 2, 2021
Accepted: November 3, 2021

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.


Download Citation: ||https://doi.org/10.4209/aaqr.200659  

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Cite this article:

Du, C., Guo, Z., Liu, S., Li, X., Dong, Z., Dong, Y., Peng, Y., Xi, Y. (2021). Dynamic Lidar Ratio Calculation and Aerosol Vertical Extinction Coefficient Retrieval Based on Observed Visibility. Aerosol Air Qual. Res. 21, 200659. https://doi.org/10.4209/aaqr.200659


HIGHLIGHTS

  • Using Lidar equation to obtain Lidar signal near ground.
  • Calculate LR based on Lidar signal and aerosol extinction coefficient near ground.
  • Retrieve aerosol vertical extinction coefficient under cloudy and night.
  • The verification effect is good (the correlation coefficient is 0.77).
 

ABSTRACT


Micropulse lidar (MPL) cannot directly retrieve the aerosol extinction coefficient under cloudy conditions and at night. Therefore, we used ground visibility, Fernald’s near-end solution method, and the linear correlation between the near-end lidar signal (photons) and ground aerosol extinction coefficient (correlation coefficient = 0.98), to calculate the lidar constant and lidar ratio (LR). We compared the aerosol optical depth (AOD) retrieved from MPL and the AOD retrieved from the multifilter rotating shadowband radiometer (MFRSR-7) at the same band (532 nm). The correlation coefficient was 0.77. The vertical distribution of aerosols in daytime and nighttime during summer was obtained from lidar in July at 00:00 and 12:00 Beijing time (UTC+8). In daytime, under clear sky conditions, the distribution displayed a unimodal and peak at approximately 2000 m. The distribution at night was more complicated than that in the day, with three results. The first was monotonically decreasing from ground to upper layer, with a peak at 600 m and two peaks at approximately 1200 m. In general, the aerosol extinction coefficient at nighttime is higher than that at daytime below 1200 m. The near-ground extinction coefficient at night is higher than in the day.


Keywords: Micropulse lidar, Dynamic lidar ratio, Visibility, AOD, Extinction coefficient




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